openstack: implement imds and metadata self

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

internal/cloud/openstack/openstack_test.go

@@ -0,0 +1,95 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package openstack
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/cloud/metadata"
+	"github.com/edgelesssys/constellation/v2/internal/role"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSelf(t *testing.T) {
+	someErr := fmt.Errorf("failed")
+
+	testCases := map[string]struct {
+		imds    imdsAPI
+		want    metadata.InstanceMetadata
+		wantErr bool
+	}{
+		"success": {
+			imds: &stubIMDSClient{
+				nameResult:       "name",
+				providerIDResult: "providerID",
+				roleResult:       role.ControlPlane,
+				vpcIPResult:      "192.0.2.1",
+			},
+			want: metadata.InstanceMetadata{
+				Name:       "name",
+				ProviderID: "providerID",
+				Role:       role.ControlPlane,
+				VPCIP:      "192.0.2.1",
+			},
+		},
+		"fail to get name": {
+			imds: &stubIMDSClient{
+				nameErr:          someErr,
+				providerIDResult: "providerID",
+				roleResult:       role.ControlPlane,
+				vpcIPResult:      "192.0.2.1",
+			},
+			wantErr: true,
+		},
+		"fail to get provider ID": {
+			imds: &stubIMDSClient{
+				nameResult:    "name",
+				providerIDErr: someErr,
+				roleResult:    role.ControlPlane,
+				vpcIPResult:   "192.0.2.1",
+			},
+			wantErr: true,
+		},
+		"fail to get role": {
+			imds: &stubIMDSClient{
+				nameResult:       "name",
+				providerIDResult: "providerID",
+				roleErr:          someErr,
+				vpcIPResult:      "192.0.2.1",
+			},
+			wantErr: true,
+		},
+		"fail to get VPC IP": {
+			imds: &stubIMDSClient{
+				nameResult:       "name",
+				providerIDResult: "providerID",
+				roleResult:       role.ControlPlane,
+				vpcIPErr:         someErr,
+			},
+			wantErr: true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			c := &Cloud{imds: tc.imds}
+
+			got, err := c.Self(context.Background())
+
+			if tc.wantErr {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+				assert.Equal(tc.want, got)
+			}
+		})
+	}
+}